Oscillating valve for rock drills



Au 31 192s. 1,598,440

c. Q-HANSEN OSCILLATING VALVE FOR ROCK DRILLS Filed may 27, 1925 INVENTOR. llzaales filial mam t ll iiilili HANSEN, 01E EAS'IDN, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-Er'lhlll CUEEPANY, Cl? JERSEY CITY, NEW JERSEY, A CORPORATION QF NEW JERSEY.

USCILLATING- VALVE FOR ROCK DEILLS.

application filed May 27, 1925. Serial No. 33,104.

This invention relates to fluid. actuated. rock drills, but more particularly to a rock drill having a plate valve in the form of an oscillating current thrown disk located rearwardly oi? the iston.

The objects of t e invention are to secure a valve construction tor rock drills in which the valve may be located in line with the cylinder and rearwardly ot the cylinder without il'lcreasing the length of the ma chine. Another object of the invention is to enable the valve to be applied to existing machines Without material change in the machine and in such location where the valve is readily accessible.

The invention is shown in one of its preferred forms in the accompanying drawings. in which- Figure l is a longitudinal sectional elevation of so much of a rock drill as will serve to illustrate the invention,

Figure 2 is a detail transverse sectional view taken through the valve chamber on the line 2 2 of Figure 1 looking upwardly in the direction of the arrows, and

Figure 3 is a detail transverse sectional view of the valve itself.

Referring to the drawings, the cylinder A is provided with the reciprocating piston B having the forward extension C and the usual rifle nut D cooperating with the rifle bar E for rotating the drill steel (not shown). The rifle bar has the rotation head F in the ratchet ring G located in the back cylinder block H. The plate J is provided with the ports K and L communicating by suitable passages with the cyl inder inlet ports 0 and P for the opposite ends of the cylinder. The cylinder is provided with the tree exhaust port. Q controlled only by the piston and the ports and passages leading to the ends of the cylinder are. controlled only by the oscillating valve R located in a valve chamber S within the back head T. The supply of pressure fluid is controlled by the throttle U in the back head and the water tube V extends from the back head through the rifle bar and piston in the usual manner.

The valve R is a plate valve in the form of an oscillating disk preferably uniformly tapered from the center or median line' iv towards the peripheral edges at X and Y so that the valve rocks about its central diameter. The valve is provided with, a central aperture Z surrounding or encircling the water tube V and a sleeve a: is preferably placed over a portion of the water tube and seated in the plate 5 and back head to form a tight COlll'iCCtlOIl. The valve is preferably guided on pins 5' entering soclrets c in the valve with suflicient clearance to permit the valve to oscillate freely. The valve seats flat upon its seat over a port K or L in either one of its positions but projections (Z on the back head 1 may be provided if desired to act as guards for the ends of the valve.

In the operation of the device. let it be assumed that the piston is at the "forward end of its stroke, as indicated in Figure l. and is traveling rearwardly. The valve is also in the position indicated in Figure l and pressure fluid entering at the throttle U passes over the periphery Y of the valve through the port L and the passages provided to the inlet port P at the forward end of the cylinder to drive the piston rearwardly. vlhcn the piston passes and uncovers the free exhaust port Q, the forward end of the cylinder is open to atmosphere and there is a drop of pressure beneath the open end of the valve while the opposite end of the valve is subjected to compression taking place in the rearward end of the cylinder, so that the valve is caused to oscillate and close the port L, opening the opposite side of the valve to permit pres sure fluid to pass through the port K and passages to the inlet port O for the rear end of the cylinder to drive the piston forwardly. From this point the cycle is re peated.

l clalm:

l. A fluid actuated rock drill comprising a cylinder and reciprocating piston a water tube extending through the piston, afree exhaust port located centrally of the cylinder and controlled only by the piston, a fluid distributing plate valve in the form of an oscillating dislr located rearwardly of the cylinder and encircling the water tube, and inlet ports for the ends of the cylin der controlled only by said valve.

Kill;

2. A. fluid actuuied ruck kiiiii cmnprising n qyiindcr and rci'ciprouniing pisum. \vutm' lube extending through 1110 p hiun. :1 sh-m'n :nound 91ml water tube. a Fri-0 vxlnmsl m located (elm-n11 of i'ne cylinder and can truliod only by the piston. H=ai l distributmy Mum who in Hm 'l'ui'n: u! an ()HVIHHIiHg disk iumtwi 1'L 1I'\(2Iil ii of the cylinder and nvirviing 171w wzm-i' tube shew, and inhrt ports i'm' iiau mafia oi the (ryiinihxi controlled only by said valve.

in lvstixnuny \xin-l'eui' I hnw, signed this fqv-xi'ifliiiQIi.

(ll I ii LES C. I [A NSEN 

